11838981 has 32 divisors (see below), whose sum is σ = 20072448. Its totient is φ = 6027840.

The previous prime is 11838979. The next prime is 11838991. The reversal of 11838981 is 18983811.

It is not a de Polignac number, because 11838981 - 2¹ = 11838979 is a prime.

It is a super-2 number, since 2×11838981² = 280322942236722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11838901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11760 + ... + 12726.

It is an arithmetic number, because the mean of its divisors is an integer number (627264).

Almost surely, 2^11838981 is an apocalyptic number.

11838981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11838981 is a deficient number, since it is larger than the sum of its proper divisors (8233467).

11838981 is a wasteful number, since it uses less digits than its factorization.

11838981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its digits is 13824, while the sum is 39.

The square root of 11838981 is about 3440.7820332012. The cubic root of 11838981 is about 227.9142298192.

The spelling of 11838981 in words is "eleven million, eight hundred thirty-eight thousand, nine hundred eighty-one".